// Copyright (C) 2013 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-getiterator
description: >
    The iterator's `next` method should be accessed only once with each
    iteration as per the `GetIterator` abstract operation (7.4.1).
features: [Symbol.iterator, for-of]
---*/

function Test() {
    var iterable = {};
    var iterator = {};
    var iterationCount = 0;
    var loadNextCount = 0;

    iterable[Symbol.iterator] = function() {
      return iterator;
    };

    function next() {
      if (iterationCount) return { done: true };
      return { value: 45, done: false };
    }
    Object.defineProperty(iterator, 'next', {
      get() { loadNextCount++; return next; },
      configurable: true
    });

    for (var x of iterable) {
      assert.sameValue(x, 45);

      Object.defineProperty(iterator, 'next', {
        get: function() {
          throw new Test262Error(
              'Should not access the `next` method after the iteration prologue.');
        }
      });
      iterationCount++;
    }
    assert.sameValue(iterationCount, 1);
    assert.sameValue(loadNextCount, 1);
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_TEST; i++) {
    Test();
}
